<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>test</title>
    <style>
        .box1{
            height: 30px;
            width: 30px;
            background-color: #4cd964;
            margin-left: 10px;
            float: left;
        }
    </style>
</head>
<body>
<div style="width: 100%;height: 400px;">
    <div class="box1"></div>
    <div class="box1"></div>
    <div class="box1"></div>
    <div class="box1"></div>

</div>
</body>
</html>
